You might check your kicker attribute weights to make sure they are set correctly, how does your SS have a better future rating than your kicker?
So for all my players, I have max weight in the stats that I've not seen change over time (Max Speed, Acceleration, Strength, Intelligence, Discipline). Then I have max weights set per position.
So my kicker has max weights on Kick Strength and Accuracy, and 0 in every other positional stat.
My SS position has max weights in only Tackle Ability, Strip Ball, Run Defense, Punish Receiver, Zone and Man-To-Man Coverage... 0 in every other positional stat.
So what's happening is my SS has higher 'intangibles' than my kicker, along with faint kicking abilities... So his Future rating is -technically- higher than my kicker's, but nowhere as high as his rating at SS (the position he's actually at).